Clamp device



Sept. 13,1938. F. c. SHNABEL CLAMP DEVICE Filed Aug. 13. 1937 Em/6,72;(7 .QZWZG/ A iiorneys Patented Sept. 13, 1938 UNITED STATES PATENT()FFICE Application August 13,

1 Claim.

This invention relates to a clamp device, the general object of theinvention being to provide a head formed to provide a jaw and a secondjaw connected with the head by a spring hinge, so that the twojaws forma clamp for holding paper or the like.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure l is an edge view of the device with the jaws closed.

Figure 2 is a similar view with the upper jaw in raised position.

Figure 3 is a top plan view of Figure 1.

Figure 4 is a perspective view with the hinged jaw removed.

Figure 5 is a perspective view of the hinged aw.

Figure 6 is a view of the pin of the hinge.

Figure '7 is a view of the spring.

As shown in these views,thehead I of the thumb tack is of substantiallyrectangular shape in cross section so as to' provide straight edgeswhich retard the tack rolling along a surface when dropped upon thesurface, so that there is less danger of the improved thumb tack beinglost than there is when the thumb tack is made with a round head, asusual. The tack is provided with the usual point 2 and at one edge thehead on its upper face is formed with the perforated ears 3 and a groove4 is formed in the head between the ears. The movable jaw is shown at 5and is of substantially the same shape as the head, but one edge of thejaw 5 is formed with the perforated hinge ears or barrels 6 which partlyextend into the groove 4 and abut the inner ends of the ears 3. A hingepin 1 passes 45 through the ears 3 and 6 and a spring 8 is placed on thepin and has a central projection 9 fitting in a recess I0 in the head I,with the ends I I of the spring resting on the upper face of 1937,Serial No. 159,015

the jaw 5. Thus this spring tends to hold the Jaw 5 against the head Iand parts of the contacting faces of the head and jaw are roughened, asshown at I2, to increase the gripping effect of the two parts.

Thus the spring hinge tends to hold the jaw 5 against the head of thethumb tack, so that these parts will grip and hold a sheet of paper orthe like.

With this invention, the thumb tack can be pressed into a drawing boardor the like and the jaw and head of the tack used for holding the paperor the like, and this will permit the paper to be changed withoutremoving the thumb tack from the board. Of course, the thumb tack can beused in the regular way, and if desired, the tack can be used in theusual manner for holding one sheet and a second sheet held by the clamp.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changesmay be made in the construction andin the combination and arrangement of the several parts, provided thatsuch changes fall within the scope of the appended claim.

What I claim is:

A device of the class described comprising a plate, perforated earsextending from one face of the plate adjacent one edge thereof and saidface of the plate having a groove therein located between the ears, theends of the groove terminating at the ears a second plate having hingebarrels extending from one edge thereof, said barrels partly fitting inthe ends of the groove and having their outer ends abutting the innerends of the ears of the first plate, a pin passing through the ears andthe barrels for hingedly connecting the two plates together, and acoiled spring on the pin having its ends engaging the outer face of thesecond plate and said spring having a central projection, the firstplate having a recess therein between the groove and the adjacent edgeof the plate, said recess opening into the groove and receiving saidprojection.

FREDERICK CHARLES SCHNABEL.

